One problem related to engine knocking noise has been reported for the 1999 Toyota 4Runner. The most recently reported issues are listed below.
The contact stated the vehicle stalls and the dealer has been unable to resolve. The contact is unsure if this is the engine and the transmission. The vehicle also has a continuous knocking sound, and a intermittent stalling problem. Also the vehicle has a vibration when it is accelerating over 50 miles per hour.